Fangrui Product Details Fangrui Product Details : High-quality Materialsl Housing. Matte Anti-fingerprint, One-button Non-slip Rotary Button, More Comfortable Touch And Scratch Resistance Than Plastic Cover Usb Plug And Play. 360-degree Rotatable Arc Button, Easy To Use (volume Adjustment, Mute, Up And Down, Pause), And Avoid Discomfort Caused By Sharp Edges Non-slip Mat. There Is A Soft Pad At The Bottom, Which Is Stable And Non-slip During Use Lossless Sound Quality. Adjust The Audio Source Directly Without Affecting The Audio Quality.suitable For Use With Desktop Or Laptop Broad Compatibility. Support Operating System For Win 7/8/10/xp, For Apple, For Vista, For Android, For Ios (mobile Phone Needs A Suitable Universal Serial Bus Adapter Cable) Specification: Name: Usb Volume Controller Installation Method: Usb Driver-free Mode: Button To Switch Dual Mode Applicable To: For Windows, For Mac Os Note: If Your Device Can Use A Usb Mouse And Keyboard, You Can Also Use Our Usb Volume Controls. Material: Plastic Colour: Black Package Contents: